Fisheries Management and Ecology最新文献

{"title":"KRILLSCAN: An automated open‐source software for processing and analysis of echosounder data from the Antarctic krill fishery","authors":"Sebastian Menze, Gavin J. Macaulay, Guosong Zhang, Andrew D. Lowther, Bjørn A. Krafft","doi":"10.1111/fme.12739","DOIUrl":"https://doi.org/10.1111/fme.12739","url":null,"abstract":"Krillscan software was developed to automatically process echosounder data and achieve an accelerated and transparent analysis of backscatter data that allows calculation of target biomass. Herein, the fishery for Antarctic krill (<jats:italic>Euphausia superba</jats:italic>, Henceforth Krill) was used as a case study to develop the approach. Implementation of a sustainable management strategy for the krill fishery is complicated by a lack of regularly updated krill abundance data on spatiotemporal scales of the fishery. To increase krill biomass data availability, automatic echosounder data processing and swarm detection software was tested against traditional manual scrutinization with LSSS software and agreed with only minor offsets in estimated nautical area scattering coefficients. In addition to automatic processing and data transfer, Krillscan also has a graphical user interface to supervise automatic krill swarm detection. Echogram size can be compressed up to 100 times and raw data are processed faster than generated, thereby enabling near‐real time analysis and data transfer. Compressed data can be transmitted online to allow fishing vessels to conduct surveys without having scientific personnel with special expertise on board.","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"8 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142217445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differences in fisher demographics and fishing behaviour from concurrent phone‐recall and smartphone app surveys of recreational angling in south‐western Australia","authors":"Fabian I. Trinnie, Karina L. Ryan","doi":"10.1111/fme.12736","DOIUrl":"https://doi.org/10.1111/fme.12736","url":null,"abstract":"Traditional methods for collecting robust samples of recreational effort and catch data from offsite mail or telephone surveys are becoming increasingly difficult to obtain. Smartphone applications (apps) that allow recreational fishers to report their effort and catch are a potentially viable data collection tool, but may be biased. We evaluated demographics, effort, and catch of freshwater anglers in south‐west Western Australia by comparing independent data from concurrent phone‐recall and app‐diary surveys for a 12‐month period in 2017–2018. Survey modes differed, with higher proportions of app respondents angling in freshwater and being avid anglers. For both survey modes, unweighted mean effort (days fished) was higher in dams than rivers, but was higher from the phone‐recall survey for dams and rivers. The unweighted distribution of kept and released catches (number of fish per angler) of rainbow trout (<jats:italic>Oncorhynchus mykiss</jats:italic>) and redfin (<jats:italic>Perca fluviatilis</jats:italic>) were similar between survey modes, with higher retention of redfin and higher release of rainbow trout. Kept and released rates of freshwater cobbler (<jats:italic>Tandanus bostocki</jats:italic>) and brown trout (<jats:italic>Salmo trutta</jats:italic>) were less common in both survey modes. Lower response rates and higher survey participation by avid anglers (≥20 days per year) from the app‐diary survey may bias survey data. Such bias needs to be addressed when using digital data collection methods, along with improving recruitment and retention of app participants.","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"112 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142217450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effectiveness of mass marking of juvenile sterlet (Acipenser ruthenus) with alizarin red S stain on field detection","authors":"Martin Šindler, Miloš Buřič, Martin Plesch, Pavel Franta, Bořek Drozd","doi":"10.1111/fme.12737","DOIUrl":"https://doi.org/10.1111/fme.12737","url":null,"abstract":"Sterlet (<jats:italic>Acipenser ruthenus</jats:italic>), one of the last sturgeons in the Danube basin, is regularly stocked in national and international restoration programs, but the efficacy of stocking has not yet been evaluated. Effectiveness of stocking should involve marking and evaluating growth and survival of juveniles. Chemical marking with alizarin red S (ARS) was evaluated to establish optimal ARS staining approaches for juvenile sterlet. Bathing in a 100–200 mg l<jats:sup>−1</jats:sup> ARS concentration for 12 h had no affect on fish mortality or growth. Use of a green laser on the upper five external structures (dorsal, lateral, and ventral scutes and rostral and anal plates) allowed easy detection for at least a year. Simultaneous use of multiple external structures was effective for distinguishing stocked from wild fish without harm or sacrifice. We conclude that ARS staining enabled a cost‐effective, quick, and labour‐nonintensive way to mark sterlet, with a high‐field detectability and minimal previous experience required.","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"55 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142217446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Delphi‐study to identify drivers of future angling participation in five Nordic countries","authors":"Stian Stensland, Christian Skov, Sveinn Agnarsson, Patrik Rönnbäck, Teppo Vehanen, Malgorzata Blicharska, Jon Olaf Olaussen, Anders Kagervall, Gustav Hellström, Samuel Blyth, Casper Gundelund, Øystein Aas","doi":"10.1111/fme.12735","DOIUrl":"https://doi.org/10.1111/fme.12735","url":null,"abstract":"The Delphi method was used to gather assessments from 93 experts about drivers of future angling participation by locals and tourist anglers in Denmark, Finland, Iceland, Norway, and Sweden. The main drivers of future angling participation related to habitat and fish populations, and access to and information about fishing. For Norway and Finland, the predicted future decline in local angler numbers was consistent with a life‐cycle model of recreational fisheries, while the anticipated increase for the three other countries contradicted the model. For tourist anglers, growth was expected for both domestic and foreign tourists. Long‐term and societal drivers, such as urbanization, sociocultural changes, and climate change were not seen as strong drivers, and may be considered out of reach by managers, but should be included with information and conservation drivers in angler recruitment and retention strategies.","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"37 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142217447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fish assemblages and first sale prices from local markets in the Lower Mekong River Basin","authors":"Quan T. Lai, Ian G. Cowx, Hoang Duc Huy, Nam So","doi":"10.1111/fme.12734","DOIUrl":"https://doi.org/10.1111/fme.12734","url":null,"abstract":"The Mekong River is the most productive inland fishery in the world and identified as a valuable source of hydropower generation. Consequently, benefits of energy production must be traded off against impacts on other ecological and environmental services, especially on fisheries that have been largely downplayed. We surveyed fish markets in 12 provinces in the Lower Mekong River Basin (LMB) to quantify the diversity, abundance and prices of fish species and to account for potential impacts of water infrastructure and development projects. Of 116 species in nine major ecological guilds in markets, potamodromous main channel spawners were the most diverse guild that contributed 30% of species and were present in markets in all countries and sites, whereas anadromous species were the least diverse guild with two species in Vietnam only. More than 45% of fish recorded in local markets in Cambodia and more than 80% in Vietnam were small‐sized fish (&lt;25 cm), whereas about 50% of fish marketed in Lao PDR and Thailand were large‐sized fish (&gt;50 cm). Fish were sold by both size and species, with most species sold in only one size category. The first‐sale price was highest in Lao PDR, followed by Thailand, Vietnam and Cambodia. Our findings provide primary ecological and economic information that can be used to estimate potential economic losses of fisheries when considering trade‐offs between energy and the environment.","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"58 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142217448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal mesh size of traps for marbled flounder (Pseudopleuronectes yokohamae) based on biological and economic factors","authors":"Myungsung Koo,&nbsp;Inyeong Kwon","doi":"10.1111/fme.12730","DOIUrl":"10.1111/fme.12730","url":null,"abstract":"<p>Gear selectivity is crucial in fisheries management because it influences the size and species of fish caught, with traditional methods often basing optimal mesh size on the mature length of a target species. However, to ensure sustainable fisheries, both biological aspects of resource protection and fishing operation efficiency must be considered. This study aimed to determine the ideal mesh size for trap fishing of marbled flounder (<i>Pseudopleuronectes yokohamae</i>) in Gyeongsangnam-do, South Korea, by using biological and economic factors for sustainable fisheries management. We sampled fish caught in traps of varying mesh sizes (35, 50, 65, 80, and 100 mm) and developed two models based on fish maturity, bycatch ratio, and CPUE. Model 1 used a maturity criterion of 17.8 cm, and Model 2 used the legal minimum length limit of 20 cm. Net selectivity curves indicated that the optimal mesh size ranged 50–65 mm based only on a minimum mature body length of 17.8 cm. In contrast, the optimal mesh size based on both biological and economic factors ranged 57.5–90 mm. Our findings could guide policymakers in enhancing marble flounder population management strategies through policy adjustments in mesh size and gear restrictions.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12730","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sorting grid usage to reduce the catch of undersized narrow-clawed crayfish (Pontastacus leptodactylus Eschscholtz, 1823) in fyke net fisheries","authors":"Mehmet Cilbiz,&nbsp;Celalettin Aydın","doi":"10.1111/fme.12731","DOIUrl":"10.1111/fme.12731","url":null,"abstract":"<p>Sustainability of natural stocks of crayfish is critical because of their economic and ecological importance. Crayfish (<i>Pontastacus leptodactylus</i>), one of the most important species in Turkish inland fisheries, has been facing serious threats recently. One threat the species faces is high landed bycatch of undersized crayfish because of selective fishing gear, such as fyke nets. We estimated size-selectivity of sorting grids with various bar spacings for crayfish to reduce bycatch. Six bar spacings (15.0, 17.5, 20.0, 22.5, 25.0, and 30.0 mm) were tested alongside commercial crayfish fyke nets. Mean selectivity (<i>L</i>₅₀) (±95% CI) was 6.90 (6.63–6.99) cm for 15.0 mm bar spacing, 7.52 (7.16–8.02) cm for 17.5 mm, 8.52 (8.32–8.71) cm for 20.0 mm, 9.70 (9.28–9.90) cm for 22.5, 10.75 (10.34–11.17) cm for 25.0 mm, 11.80 (11.31–12.24) cm for 30.0 mm, and 8.79 (8.05–9.29) cm for commercial fyke nets. The proportion of undersized specimens caught be reduced from 32.27% for commercial fyke nets to as low as 2.46% by using sorting grids. The codend of 22.5 mm bar spacing was more selective, with significantly lower discard rates, and more effective for individuals above the minimum conservation reference size than commercial fyke nets.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12731","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climate change effects on abundance and distribution of the European eel in Türkiye","authors":"Burcu Mestav,&nbsp;Şükran Yalçın Özdilek,&nbsp;Zahide Acar,&nbsp;Kemal Gökkaya,&nbsp;Nurbanu Partal","doi":"10.1111/fme.12732","DOIUrl":"10.1111/fme.12732","url":null,"abstract":"<p>Spatial and temporal distribution of European eel (<i>Anguilla anguilla</i>) during 1967–2020 was used to model European eel distribution in response to climate variability. Modeling integrated predictions from two distinct models for inferences. First, modeling of the relationship between temperature and precipitation and European eel catch values using multiple time-series regression analyses showed that climate variables contributed to eel distribution in Türkiye. Eel catch became restricted to western and southern coasts of Türkiye and total catch decreased between 1967 and 2020. From 1967 to 2020, favorable climatic conditions for European eels in Türkiye were characterized by moderate temperatures. Furthermore, projections for 2050 and 2070 suggested that suitable habitat would be lost in Türkiye. Our findings underscore the urgent need for immediate and widespread implementation of effective conservation policies to mitigate threats to European eel in Türkiye and globally.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12732","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141881870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling food web and fisheries dynamics in Lake Baringo, Kenya","authors":"Jacques Riziki Walumona,&nbsp;Boaz Kaunda-Arara,&nbsp;Cyprian Ogombe Odoli,&nbsp;Pascal Masilya Mulungula,&nbsp;Raburu Philip,&nbsp;Benjamin Nelson Kondowe,&nbsp;Nyakeya Kobingi,&nbsp;Mugo James Murakaru,&nbsp;Mbalassa Mulongaibalu,&nbsp;Fabrice Amisi Muvundja","doi":"10.1111/fme.12725","DOIUrl":"10.1111/fme.12725","url":null,"abstract":"<p>Lakes are important in supporting ecosystem services and livelihoods. However, their food webs and ecological functioning are continuously threatened by anthropogenic influences. Food web models have been widely used in studying trophodynamics, fisheries impacts, and ecological functioning of temperate lakes, but less often in Afrotropical lake systems. We used Ecopath mass-balanced trophic models annually in 1999, 2010, and 2020 to assess trends in ecosystem function, and the impact of fisheries on the Lake Baringo Ecosystem, a shallow freshwater lake in Kenya. Pre-balance (PREBAL) and Pedigree analyses supplemented Ecopath models. Model input data were from field sampling, published and gray literature. Food web trophic models indicated a bottom-up grazer and detrital food chains in all 3 years. Odum's ecosystem development indicators (total productivity to total biomass and total respiration ratios; TPP/TB and TPP/TR) showed that the lake was in a low to intermediate developmental stage, with room for bio-manipulation, and a highly reduced mean transfer efficiency (TE) (6.4%–0.49%) indicated low trophic transfer of internal production. System omnivory (SOI) and connectance (CI) indices that varied among years indicated temporal variation in food web complexity. Indices of system resilience (overhead and ascendency) indicated an increasing potential for the lake to recover from perturbations. The mean trophic level of the catch (MTLc) increased from 1999 to 2010 and decreased in 2020, by fishing down the food chain as fishing pressure increased. <i>Oreochromis niloticus</i>, an endemic cichlid, was the keystone species (KSi &gt;0) controlling community structure, while the lungfish <i>Protopterus aethiopicus</i>, the top predator in the lake, was not a keystone species (KSi &lt;0). We recommend an integrated approach to lake management that incorporates watershed regulations, regulates fishing effort on the keystone species (<i>O. niloticus</i>), and monitors water quality for sustainable management of the Lake Baringo ecosystem.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141650479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ecosystem responses to a whole-reservoir coarse woody habitat addition","authors":"C. C. Fenstermacher,&nbsp;D. S. Radford,&nbsp;A. P. Porreca,&nbsp;G. G. Sass,&nbsp;J. J. Parkos III","doi":"10.1111/fme.12728","DOIUrl":"10.1111/fme.12728","url":null,"abstract":"<p>The addition of coarse woody habitat (CWH) is often used to mitigate the loss of natural structure in aging waterbodies. Ecosystem-scale effects of large-scale CWH additions and their influence on fish productivity have been assessed in oligotrophic, natural lakes, but need to be assessed in more ecosystems. Therefore, we tested the effects of an ecosystem-scale addition of CWH to a eutrophic reservoir using a reference reservoir and data from 4 years before and 4 years after habitat enhancement. Zooplankton and benthic macroinvertebrates did not respond to the addition of CWH, but bluegill (<i>Lepomis macrochirus</i>) reproductive productivity and largemouth bass (<i>Micropterus salmoides</i>) size structure increased. Positive fish responses that contrasted with a lack of fish population-level responses after a similar CWH addition in an oligotrophic, natural lake highlight the importance of assessing the efficacy of CWH addition across diverse ecosystems.</p>","PeriodicalId":50444,"journal":{"name":"Fisheries Management and Ecology","volume":"31 6","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fme.12728","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141610492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}